diff --git a/tasmota/xdrv_79_esp32_ble.ino b/tasmota/xdrv_79_esp32_ble.ino
index 2aba0896c..8593d94f0 100644
--- a/tasmota/xdrv_79_esp32_ble.ino
+++ b/tasmota/xdrv_79_esp32_ble.ino
@@ -1259,8 +1259,11 @@ void postAdvertismentDetails(){
 
   TasAutoMutex localmutex(&BLEOperationsRecursiveMutex, "BLEPostAdd");
   if (BLEAdvertismentDetailsJsonSet){
-    strncpy(TasmotaGlobal.mqtt_data, BLEAdvertismentDetailsJson, sizeof(TasmotaGlobal.mqtt_data));
-    TasmotaGlobal.mqtt_data[sizeof(TasmotaGlobal.mqtt_data)-1] = 0;
+
+//    strncpy(TasmotaGlobal.mqtt_data, BLEAdvertismentDetailsJson, sizeof(TasmotaGlobal.mqtt_data));
+//    TasmotaGlobal.mqtt_data[sizeof(TasmotaGlobal.mqtt_data)-1] = 0;
+    Response_P(BLEAdvertismentDetailsJson);
+
     BLEAdvertismentDetailsJsonSet = 0;
     // we got the data, give before MQTT call.
     localmutex.give();
@@ -3142,6 +3145,7 @@ void CmndBLEOperation(void){
 \*********************************************************************************************/
 static void BLEPostMQTTSeenDevices(int type) {
   int remains = 0;
+/*
   nextSeenDev = 0;
 
   memset(TasmotaGlobal.mqtt_data, 0, sizeof(TasmotaGlobal.mqtt_data));
@@ -3156,6 +3160,19 @@ static void BLEPostMQTTSeenDevices(int type) {
     MqttPublishPrefixTopicRulesProcess_P((1== type) ? TELE : STAT, PSTR("BLE"));
   } while (remains);
 //  }
+*/
+
+  // Once TasmotaGlobal.mqtt_data is changed from (limited by MESSZ) char array to (unlimited) String the below code can be simplified
+  char dest[ResponseSize()];
+  int maxlen = ResponseSize() -64;
+
+  do {
+    remains = getSeenDevicesToJson(dest, maxlen);
+    ResponseTime_P(dest);
+    // no retain - this is present devices, not historic
+    MqttPublishPrefixTopicRulesProcess_P((1== type) ? TELE : STAT, PSTR("BLE"));
+  } while (remains);
+
 }
 
 static void BLEPostMQTT(bool onlycompleted) {
diff --git a/tasmota/xsns_27_apds9960.ino b/tasmota/xsns_27_apds9960.ino
index b1619ff40..2182d923c 100644
--- a/tasmota/xsns_27_apds9960.ino
+++ b/tasmota/xsns_27_apds9960.ino
@@ -1784,7 +1784,7 @@ void APDS9960_loop(void) {
     enableGestureSensor();
     APDS9960_overload = false;
     Response_P(PSTR("{\"Gesture\":\"On\"}"));
-    MqttPublishPrefixTopicRulesProcess_P(RESULT_OR_TELE, TasmotaGlobal.mqtt_data);  // only after the long break we report, that we are online again
+    MqttPublishPrefixTopicRulesProcess_P(RESULT_OR_TELE, APDS9960_TAG);  // only after the long break we report, that we are online again
     gesture_mode = 1;
   }
 
@@ -1796,7 +1796,7 @@ void APDS9960_loop(void) {
         disableGestureSensor();
         recovery_loop_counter = APDS9960_LONG_RECOVERY;  // long pause after overload/long press - number of stateloops
         Response_P(PSTR("{\"Gesture\":\"Off\"}"));
-        MqttPublishPrefixTopicRulesProcess_P(RESULT_OR_TELE, TasmotaGlobal.mqtt_data);
+        MqttPublishPrefixTopicRulesProcess_P(RESULT_OR_TELE, APDS9960_TAG);
         gesture_mode = 0;
       }
     }
diff --git a/tasmota/xsns_61_MI_NRF24.ino b/tasmota/xsns_61_MI_NRF24.ino
index 7282435fe..77503717d 100644
--- a/tasmota/xsns_61_MI_NRF24.ino
+++ b/tasmota/xsns_61_MI_NRF24.ino
@@ -1682,6 +1682,14 @@ const char HTTP_MINRF_FLORA_DATA[] PROGMEM =  "{s}%s" " Fertility" "{m}%dus/cm{e
 const char HTTP_MINRF_HL[] PROGMEM = "{s}<hr>{m}<hr>{e}";
 const char HTTP_NRF24NEW[] PROGMEM = "{s}%sL01%c{m}%u%s / %u{e}";
 
+void MINRFShowContinuation(bool *commaflg) {
+  if (*commaflg) {
+    ResponseAppend_P(PSTR(","));
+  } else {
+    *commaflg = true;
+  }
+}
+
 void MINRFShow(bool json)
 {
   if (json) {
@@ -1706,9 +1714,9 @@ void MINRFShow(bool json)
         if(MIBLEsensors[i].type != YEERC) break; // send every RC code, even if there is a potentially false MAC
         }
 
-      ResponseAppend_P(PSTR(",\"%s-%02x%02x%02x\":"),kMINRFDeviceType[MIBLEsensors[i].type-1],MIBLEsensors[i].MAC[3],MIBLEsensors[i].MAC[4],MIBLEsensors[i].MAC[5]);
-
-      uint32_t _positionCurlyBracket = ResponseLength(); // ... this will be a ',' first, but later be replaced
+      bool commaflg = false;
+      ResponseAppend_P(PSTR(",\"%s-%02x%02x%02x\":{"),
+        kMINRFDeviceType[MIBLEsensors[i].type-1],MIBLEsensors[i].MAC[3],MIBLEsensors[i].MAC[4],MIBLEsensors[i].MAC[5]);
 
       if((!MINRF.mode.triggeredTele && !MINRF.option.minimalSummary)||MINRF.mode.triggeredTele){
         bool tempHumSended = false;
@@ -1719,7 +1727,7 @@ void MINRFShow(bool json)
               ||(!hass_mode==2)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(","));
+              MINRFShowContinuation(&commaflg);
               ResponseAppendTHD(MIBLEsensors[i].temp, MIBLEsensors[i].hum);
               tempHumSended = true;
             }
@@ -1732,7 +1740,8 @@ void MINRFShow(bool json)
               ||(hass_mode==2)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"" D_JSON_TEMPERATURE "\":%*_f"),
+              MINRFShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_TEMPERATURE "\":%*_f"),
                 Settings.flag2.temperature_resolution, &MIBLEsensors[i].temp);
             }
           }
@@ -1742,7 +1751,8 @@ void MINRFShow(bool json)
             if (!isnan(MIBLEsensors[i].hum)) {
               char hum[FLOATSZ];
               dtostrfd(MIBLEsensors[i].hum, Settings.flag2.humidity_resolution, hum);
-              ResponseAppend_P(PSTR(",\"" D_JSON_HUMIDITY "\":%s"), hum);
+              MINRFShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_HUMIDITY "\":%s"), hum);
             }
           }
         }
@@ -1753,7 +1763,8 @@ void MINRFShow(bool json)
               ||(hass_mode==2)
 #endif //USE_HOME_ASSISTANT
             ) { // this is the error code -> no lux
-              ResponseAppend_P(PSTR(",\"" D_JSON_ILLUMINANCE "\":%u"), MIBLEsensors[i].lux);
+              MINRFShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_ILLUMINANCE "\":%u"), MIBLEsensors[i].lux);
             }
           }
         }
@@ -1764,7 +1775,8 @@ void MINRFShow(bool json)
               ||(hass_mode==2)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"" D_JSON_MOISTURE "\":%u"), MIBLEsensors[i].moisture);
+              MINRFShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_MOISTURE "\":%u"), MIBLEsensors[i].moisture);
             }
           }
         }
@@ -1775,29 +1787,37 @@ void MINRFShow(bool json)
               ||(hass_mode==2)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"Fertility\":%u"), MIBLEsensors[i].fertility);
+              MINRFShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"Fertility\":%u"), MIBLEsensors[i].fertility);
             }
           }
         }
         if (MIBLEsensors[i].feature.Btn){
           if(MIBLEsensors[i].eventType.Btn){
-            ResponseAppend_P(PSTR(",\"Btn\":%u"),MIBLEsensors[i].Btn);
+            MINRFShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"Btn\":%u"),MIBLEsensors[i].Btn);
           }
         }
       } // minimal summary
       if (MIBLEsensors[i].feature.PIR){
         if(MIBLEsensors[i].eventType.motion || !MINRF.mode.triggeredTele){
-          if(MINRF.mode.triggeredTele) ResponseAppend_P(PSTR(",\"PIR\":1")); // only real-time
-          ResponseAppend_P(PSTR(",\"Events\":%u"),MIBLEsensors[i].events);
+          if(MINRF.mode.triggeredTele) {
+            MINRFShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"PIR\":1")); // only real-time
+          }
+          MINRFShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"Events\":%u"),MIBLEsensors[i].events);
         }
         else if(MIBLEsensors[i].eventType.noMotion && MINRF.mode.triggeredTele){
-          ResponseAppend_P(PSTR(",\"PIR\":0"));
+          MINRFShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"PIR\":0"));
         }
       }
 
       if (MIBLEsensors[i].feature.NMT || !MINRF.mode.triggeredTele){
         if(MIBLEsensors[i].eventType.NMT){
-          ResponseAppend_P(PSTR(",\"NMT\":%u"), MIBLEsensors[i].NMT);
+          MINRFShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"NMT\":%u"), MIBLEsensors[i].NMT);
         }
       }
       if (MIBLEsensors[i].feature.bat){
@@ -1807,13 +1827,13 @@ void MINRFShow(bool json)
               ||(hass_mode==2)
 #endif //USE_HOME_ASSISTANT
           ) {
-          ResponseAppend_P(PSTR(",\"Battery\":%u"), MIBLEsensors[i].bat);
+          MINRFShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"Battery\":%u"), MIBLEsensors[i].bat);
           }
         }
       }
-      if(_positionCurlyBracket==ResponseLength()) ResponseAppend_P(PSTR(",")); // write some random char, to be overwritten in the next step
-      ResponseAppend_P(PSTR("}"));
-      TasmotaGlobal.mqtt_data[_positionCurlyBracket] = '{';
+      ResponseJsonEnd();
+
       MIBLEsensors[i].eventType.raw = 0;
       if(MIBLEsensors[i].shallSendMQTT==1){
         MIBLEsensors[i].shallSendMQTT = 0;
diff --git a/tasmota/xsns_62_MI_HM10.ino b/tasmota/xsns_62_MI_HM10.ino
index ffb2bd81e..e9b0519d6 100644
--- a/tasmota/xsns_62_MI_HM10.ino
+++ b/tasmota/xsns_62_MI_HM10.ino
@@ -453,23 +453,7 @@ void HM10_ReverseMAC(uint8_t _mac[]){
   }
   memcpy(_mac,_reversedMAC, sizeof(_reversedMAC));
 }
-#ifdef USE_HOME_ASSISTANT
-/**
- * @brief For HASS only, changes last entry of JSON in mqtt_data to 'null'
- */
 
-void HM10nullifyEndOfMQTT_DATA(){
-  char *p = TasmotaGlobal.mqtt_data + ResponseLength();
-  while(true){
-    *p--;
-    if(p[0]==':'){
-      p[1] = 0;
-      break;
-    }
-  }
-  ResponseAppend_P(PSTR("null"));
-}
-#endif // USE_HOME_ASSISTANT
 /*********************************************************************************************\
  * chained tasks
 \*********************************************************************************************/
@@ -1058,7 +1042,7 @@ void HM10showScanResults(){
     ToHex_P(_scanResult.MAC,6,_MAC,18,':');
     ResponseAppend_P(PSTR("%s{\"MAC\":\"%s\",\"CID\":\"0x%04x\",\"SVC\":\"0x%04x\",\"UUID\":\"0x%04x\",\"RSSI\":%d}"),
       (add_comma)?",":"", _MAC, _scanResult.CID, _scanResult.SVC, _scanResult.UUID, _scanResult.RSSI);
-    add_comma = true;  
+    add_comma = true;
   }
   ResponseAppend_P(PSTR("]}"));
   MIBLEscanResult.clear();
@@ -1072,7 +1056,7 @@ void HM10showBlockList(){
     char _MAC[18];
     ToHex_P(_scanResult.buf,6,_MAC,18,':');
     ResponseAppend_P(PSTR("%s\"%s\""), (add_comma)?",":"", _MAC);
-    add_comma = true;  
+    add_comma = true;
   }
   ResponseAppend_P(PSTR("]"));
   HM10.mode.shallShowBlockList = 0;
@@ -1750,6 +1734,14 @@ const char HTTP_RSSI[] PROGMEM = "{s}%s " D_RSSI "{m}%d dBm{e}";
 const char HTTP_HM10_FLORA_DATA[] PROGMEM = "{s}%s" " Fertility" "{m}%u us/cm{e}";
 const char HTTP_HM10_HL[] PROGMEM = "{s}<hr>{m}<hr>{e}";
 
+void HM10ShowContinuation(bool *commaflg) {
+  if (*commaflg) {
+    ResponseAppend_P(PSTR(","));
+  } else {
+    *commaflg = true;
+  }
+}
+
 void HM10Show(bool json)
 {
   if (json) {
@@ -1781,12 +1773,11 @@ void HM10Show(bool json)
       if(HM10.mode.triggeredTele && MIBLEsensors[i].eventType.raw == 0) continue;
       if(HM10.mode.triggeredTele && MIBLEsensors[i].shallSendMQTT==0) continue;
 
-      ResponseAppend_P(PSTR(",\"%s-%02x%02x%02x\":"), // do not add the '{' now ...
+      bool commaflg = false;
+      ResponseAppend_P(PSTR(",\"%s-%02x%02x%02x\":{"),
         kHM10DeviceType[MIBLEsensors[i].type-1],
         MIBLEsensors[i].MAC[3], MIBLEsensors[i].MAC[4], MIBLEsensors[i].MAC[5]);
 
-      uint32_t _positionCurlyBracket = ResponseLength(); // ... this will be a ',' first, but later be replaced
-
       if((!HM10.mode.triggeredTele && !HM10.option.minimalSummary)||HM10.mode.triggeredTele){
         bool tempHumSended = false;
         if(MIBLEsensors[i].feature.tempHum){
@@ -1796,7 +1787,7 @@ void HM10Show(bool json)
               ||(hass_mode!=-1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(","));
+              HM10ShowContinuation(&commaflg);
               ResponseAppendTHD(MIBLEsensors[i].temp, MIBLEsensors[i].hum);
               tempHumSended = true;
             }
@@ -1809,7 +1800,8 @@ void HM10Show(bool json)
               ||(hass_mode!=-1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"" D_JSON_TEMPERATURE "\":%*_f"),
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_TEMPERATURE "\":%*_f"),
                 Settings.flag2.temperature_resolution, &MIBLEsensors[i].temp);
             }
           }
@@ -1823,99 +1815,124 @@ void HM10Show(bool json)
             ) {
               char hum[FLOATSZ];
               dtostrfd(MIBLEsensors[i].hum, Settings.flag2.humidity_resolution, hum);
-              ResponseAppend_P(PSTR(",\"" D_JSON_HUMIDITY "\":%s"), hum);
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_HUMIDITY "\":%s"), hum);
             }
           }
         }
         if (MIBLEsensors[i].feature.lux){
           if(MIBLEsensors[i].eventType.lux || !HM10.mode.triggeredTele || HM10.option.allwaysAggregate){
-            if (MIBLEsensors[i].lux!=0x0ffffff
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+            if ((hass_mode != -1) && (MIBLEsensors[i].lux == 0x0ffffff)) {
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_ILLUMINANCE "\":null"));
+            } else
+#endif //USE_HOME_ASSISTANT
+            if ((MIBLEsensors[i].lux != 0x0ffffff)
+#ifdef USE_HOME_ASSISTANT
+              || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
             ) { // this is the error code -> no lux
-              ResponseAppend_P(PSTR(",\"" D_JSON_ILLUMINANCE "\":%u"), MIBLEsensors[i].lux);
-#ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].lux==0x0ffffff) HM10nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_ILLUMINANCE "\":%u"), MIBLEsensors[i].lux);
             }
           }
         }
         if (MIBLEsensors[i].feature.moist){
           if(MIBLEsensors[i].eventType.moist || !HM10.mode.triggeredTele || HM10.option.allwaysAggregate){
-            if (MIBLEsensors[i].moisture!=0xff
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+            if ((hass_mode != -1) && (MIBLEsensors[i].moisture == 0xff)) {
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_MOISTURE "\":null"));
+            } else
+#endif //USE_HOME_ASSISTANT
+            if ((MIBLEsensors[i].moisture != 0xff)
+#ifdef USE_HOME_ASSISTANT
+              || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"" D_JSON_MOISTURE "\":%u"), MIBLEsensors[i].moisture);
-#ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].moisture==0xff) HM10nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_MOISTURE "\":%u"), MIBLEsensors[i].moisture);
             }
           }
         }
         if (MIBLEsensors[i].feature.fert){
           if(MIBLEsensors[i].eventType.fert || !HM10.mode.triggeredTele || HM10.option.allwaysAggregate){
-            if (MIBLEsensors[i].fertility!=0xffff
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+            if ((hass_mode != -1) && (MIBLEsensors[i].fertility == 0xffff)) {
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"Fertility\":null"));
+            } else
+#endif //USE_HOME_ASSISTANT
+            if ((MIBLEsensors[i].fertility != 0xffff)
+#ifdef USE_HOME_ASSISTANT
+              || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"Fertility\":%u"), MIBLEsensors[i].fertility);
-#ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].fertility==0xffff) HM10nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
+              HM10ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"Fertility\":%u"), MIBLEsensors[i].fertility);
             }
           }
         }
         if (MIBLEsensors[i].feature.Btn){
           if(MIBLEsensors[i].eventType.Btn){
-            ResponseAppend_P(PSTR(",\"Btn\":%u"),MIBLEsensors[i].Btn);
+            HM10ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"Btn\":%u"),MIBLEsensors[i].Btn);
           }
         }
       } // minimal summary
       if (MIBLEsensors[i].feature.PIR){
         if(MIBLEsensors[i].eventType.motion || !HM10.mode.triggeredTele){
-          if(HM10.mode.triggeredTele) ResponseAppend_P(PSTR(",\"PIR\":1")); // only real-time
-          ResponseAppend_P(PSTR(",\"Events\":%u"),MIBLEsensors[i].events);
+          if(HM10.mode.triggeredTele) {
+            HM10ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"PIR\":1")); // only real-time
+          }
+          HM10ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"Events\":%u"),MIBLEsensors[i].events);
         }
         else if(MIBLEsensors[i].eventType.noMotion && HM10.mode.triggeredTele){
-          ResponseAppend_P(PSTR(",\"PIR\":0"));
+          HM10ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"PIR\":0"));
         }
       }
 
       if (MIBLEsensors[i].type == FLORA && !HM10.mode.triggeredTele) {
         if (MIBLEsensors[i].firmware[0] != '\0') { // this is the error code -> no firmware
-          ResponseAppend_P(PSTR(",\"Firmware\":\"%s\""), MIBLEsensors[i].firmware);
+          HM10ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"Firmware\":\"%s\""), MIBLEsensors[i].firmware);
         }
       }
 
       if (MIBLEsensors[i].feature.NMT || !HM10.mode.triggeredTele){
         if(MIBLEsensors[i].eventType.NMT){
-          ResponseAppend_P(PSTR(",\"NMT\":%u"), MIBLEsensors[i].NMT);
+          HM10ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"NMT\":%u"), MIBLEsensors[i].NMT);
         }
       }
       if (MIBLEsensors[i].feature.bat){
         if(MIBLEsensors[i].eventType.bat || !HM10.mode.triggeredTele || HM10.option.allwaysAggregate){
-          if (MIBLEsensors[i].bat != 0x00
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+          if ((hass_mode != -1) && (MIBLEsensors[i].bat == 0x00)) {
+            HM10ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"Battery\":null"));
+          } else
 #endif //USE_HOME_ASSISTANT
-          ) { // this is the error code -> no battery
-          ResponseAppend_P(PSTR(",\"Battery\":%u"), MIBLEsensors[i].bat);
+          if ((MIBLEsensors[i].bat != 0x00)
 #ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].bat == 0x00) HM10nullifyEndOfMQTT_DATA();
+            || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
+          ) {
+            HM10ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"Battery\":%u"), MIBLEsensors[i].bat);
           }
         }
       }
-      if (HM10.option.showRSSI) ResponseAppend_P(PSTR(",\"RSSI\":%d"), MIBLEsensors[i].rssi);
+      if (HM10.option.showRSSI) {
+        HM10ShowContinuation(&commaflg);
+        ResponseAppend_P(PSTR("\"RSSI\":%d"), MIBLEsensors[i].rssi);
+      }
+      ResponseJsonEnd();
 
-
-      if(_positionCurlyBracket==ResponseLength()) ResponseAppend_P(PSTR(",")); // write some random char, to be overwritten in the next step
-      ResponseAppend_P(PSTR("}"));
-      TasmotaGlobal.mqtt_data[_positionCurlyBracket] = '{';
       MIBLEsensors[i].eventType.raw = 0;
       if(MIBLEsensors[i].shallSendMQTT==1){
         MIBLEsensors[i].shallSendMQTT = 0;
diff --git a/tasmota/xsns_62_esp32_mi.ino b/tasmota/xsns_62_esp32_mi.ino
index 3a9a3a68a..f77b959a2 100644
--- a/tasmota/xsns_62_esp32_mi.ino
+++ b/tasmota/xsns_62_esp32_mi.ino
@@ -628,24 +628,6 @@ int MI32_decryptPacket(char *_buf, uint16_t _bufSize, uint32_t _type){
 }
 #endif // USE_MI_DECRYPTION
 
-#ifdef USE_HOME_ASSISTANT
-/**
- * @brief For HASS only, changes last entry of JSON in mqtt_data to 'null'
- */
-
-void MI32nullifyEndOfMQTT_DATA(){
-  char *p = TasmotaGlobal.mqtt_data + ResponseLength();
-  while(true){
-    *p--;
-    if(p[0]==':'){
-      p[1] = 0;
-      break;
-    }
-  }
-  ResponseAppend_P(PSTR("null"));
-}
-#endif // USE_HOME_ASSISTANT
-
 /*********************************************************************************************\
  * common functions
 \*********************************************************************************************/
@@ -1993,6 +1975,14 @@ const char HTTP_NMT[] PROGMEM = "{s}%s No motion{m}> %u seconds{e}";
 const char HTTP_MI32_FLORA_DATA[] PROGMEM = "{s}%s" " Fertility" "{m}%u us/cm{e}";
 const char HTTP_MI32_HL[] PROGMEM = "{s}<hr>{m}<hr>{e}";
 
+void MI32ShowContinuation(bool *commaflg) {
+  if (*commaflg) {
+    ResponseAppend_P(PSTR(","));
+  } else {
+    *commaflg = true;
+  }
+}
+
 void MI32Show(bool json)
 {
   if (json) {
@@ -2026,12 +2016,11 @@ void MI32Show(bool json)
       if(MI32.mode.triggeredTele && MIBLEsensors[i].eventType.raw == 0) continue;
       if(MI32.mode.triggeredTele && MIBLEsensors[i].shallSendMQTT==0) continue;
 
-      ResponseAppend_P(PSTR(",\"%s-%02x%02x%02x\":"), // do not add the '{' now ...
+      bool commaflg = false;
+      ResponseAppend_P(PSTR(",\"%s-%02x%02x%02x\":{"),
         kMI32DeviceType[MIBLEsensors[i].type-1],
         MIBLEsensors[i].MAC[3], MIBLEsensors[i].MAC[4], MIBLEsensors[i].MAC[5]);
 
-      uint32_t _positionCurlyBracket = ResponseLength(); // ... this will be a ',' first, but later be replaced
-
       if((!MI32.mode.triggeredTele && !MI32.option.minimalSummary)||MI32.mode.triggeredTele){
         bool tempHumSended = false;
         if(MIBLEsensors[i].feature.tempHum){
@@ -2041,7 +2030,7 @@ void MI32Show(bool json)
               ||(hass_mode!=-1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(","));
+              MI32ShowContinuation(&commaflg);
               ResponseAppendTHD(MIBLEsensors[i].temp, MIBLEsensors[i].hum);
               tempHumSended = true;
             }
@@ -2054,7 +2043,8 @@ void MI32Show(bool json)
               ||(hass_mode!=-1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"" D_JSON_TEMPERATURE "\":%*_f"),
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_TEMPERATURE "\":%*_f"),
                 Settings.flag2.temperature_resolution, &MIBLEsensors[i].temp);
             }
           }
@@ -2068,49 +2058,62 @@ void MI32Show(bool json)
             ) {
               char hum[FLOATSZ];
               dtostrfd(MIBLEsensors[i].hum, Settings.flag2.humidity_resolution, hum);
-              ResponseAppend_P(PSTR(",\"" D_JSON_HUMIDITY "\":%s"), hum);
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_HUMIDITY "\":%s"), hum);
             }
           }
         }
         if (MIBLEsensors[i].feature.lux){
           if(MIBLEsensors[i].eventType.lux || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-            if (MIBLEsensors[i].lux!=0x0ffffff
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+            if ((hass_mode != -1) && (MIBLEsensors[i].lux == 0x0ffffff)) {
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_ILLUMINANCE "\":null"));
+            } else
+#endif //USE_HOME_ASSISTANT
+            if ((MIBLEsensors[i].lux != 0x0ffffff)
+#ifdef USE_HOME_ASSISTANT
+              || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
             ) { // this is the error code -> no lux
-              ResponseAppend_P(PSTR(",\"" D_JSON_ILLUMINANCE "\":%u"), MIBLEsensors[i].lux);
-#ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].lux==0x0ffffff) MI32nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_ILLUMINANCE "\":%u"), MIBLEsensors[i].lux);
             }
           }
         }
         if (MIBLEsensors[i].feature.moist){
           if(MIBLEsensors[i].eventType.moist || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-            if (MIBLEsensors[i].moisture!=0xff
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+            if ((hass_mode != -1) && (MIBLEsensors[i].moisture == 0xff)) {
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_MOISTURE "\":null"));
+            } else
+#endif //USE_HOME_ASSISTANT
+            if ((MIBLEsensors[i].moisture != 0xff)
+#ifdef USE_HOME_ASSISTANT
+              || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"" D_JSON_MOISTURE "\":%u"), MIBLEsensors[i].moisture);
-#ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].moisture==0xff) MI32nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"" D_JSON_MOISTURE "\":%u"), MIBLEsensors[i].moisture);
             }
           }
         }
         if (MIBLEsensors[i].feature.fert){
           if(MIBLEsensors[i].eventType.fert || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-            if (MIBLEsensors[i].fertility!=0xffff
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+            if ((hass_mode != -1) && (MIBLEsensors[i].fertility == 0xffff)) {
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"Fertility\":null"));
+            } else
+#endif //USE_HOME_ASSISTANT
+            if ((MIBLEsensors[i].fertility != 0xffff)
+#ifdef USE_HOME_ASSISTANT
+              || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
             ) {
-              ResponseAppend_P(PSTR(",\"Fertility\":%u"), MIBLEsensors[i].fertility);
-#ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].fertility==0xffff) MI32nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
+              MI32ShowContinuation(&commaflg);
+              ResponseAppend_P(PSTR("\"Fertility\":%u"), MIBLEsensors[i].fertility);
             }
           }
         }
@@ -2120,50 +2123,63 @@ void MI32Show(bool json)
               ||(hass_mode==2)
 #endif //USE_HOME_ASSISTANT
           ){
-            ResponseAppend_P(PSTR(",\"Btn\":%u"),MIBLEsensors[i].Btn);
+            MI32ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"Btn\":%u"),MIBLEsensors[i].Btn);
           }
         }
       } // minimal summary
       if (MIBLEsensors[i].feature.PIR){
         if(MIBLEsensors[i].eventType.motion || !MI32.mode.triggeredTele){
-          if(MI32.mode.triggeredTele) ResponseAppend_P(PSTR(",\"PIR\":1")); // only real-time
-          ResponseAppend_P(PSTR(",\"Events\":%u"),MIBLEsensors[i].events);
+          if(MI32.mode.triggeredTele) {
+            MI32ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"PIR\":1")); // only real-time
+          }
+          MI32ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"Events\":%u"),MIBLEsensors[i].events);
         }
         else if(MIBLEsensors[i].eventType.noMotion && MI32.mode.triggeredTele){
-          ResponseAppend_P(PSTR(",\"PIR\":0"));
+          MI32ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"PIR\":0"));
         }
       }
 
       if (MIBLEsensors[i].type == FLORA && !MI32.mode.triggeredTele) {
         if (MIBLEsensors[i].firmware[0] != '\0') { // this is the error code -> no firmware
-          ResponseAppend_P(PSTR(",\"Firmware\":\"%s\""), MIBLEsensors[i].firmware);
+          MI32ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"Firmware\":\"%s\""), MIBLEsensors[i].firmware);
         }
       }
 
       if (MIBLEsensors[i].feature.NMT || !MI32.mode.triggeredTele){
         if(MIBLEsensors[i].eventType.NMT){
-          ResponseAppend_P(PSTR(",\"NMT\":%u"), MIBLEsensors[i].NMT);
+          MI32ShowContinuation(&commaflg);
+          ResponseAppend_P(PSTR("\"NMT\":%u"), MIBLEsensors[i].NMT);
         }
       }
       if (MIBLEsensors[i].feature.bat){
         if(MIBLEsensors[i].eventType.bat || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-          if (MIBLEsensors[i].bat != 0x00
 #ifdef USE_HOME_ASSISTANT
-              ||(hass_mode!=-1)
+          if ((hass_mode != -1) && (MIBLEsensors[i].bat == 0x00)) {
+            MI32ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"Battery\":null"));
+          } else
 #endif //USE_HOME_ASSISTANT
-          ) { // this is the error code -> no battery
-          ResponseAppend_P(PSTR(",\"Battery\":%u"), MIBLEsensors[i].bat);
+          if ((MIBLEsensors[i].bat != 0x00)
 #ifdef USE_HOME_ASSISTANT
-              if (MIBLEsensors[i].bat == 0x00) MI32nullifyEndOfMQTT_DATA();
+            || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
+          ) {
+            MI32ShowContinuation(&commaflg);
+            ResponseAppend_P(PSTR("\"Battery\":%u"), MIBLEsensors[i].bat);
           }
         }
       }
-      if (MI32.option.showRSSI) ResponseAppend_P(PSTR(",\"RSSI\":%d"), MIBLEsensors[i].RSSI);
+      if (MI32.option.showRSSI) {
+        MI32ShowContinuation(&commaflg);
+        ResponseAppend_P(PSTR("\"RSSI\":%d"), MIBLEsensors[i].RSSI);
+      }
+      ResponseJsonEnd();
 
-      if(_positionCurlyBracket==ResponseLength()) ResponseAppend_P(PSTR(",")); // write some random char, to be overwritten in the next step
-      ResponseAppend_P(PSTR("}"));
-      TasmotaGlobal.mqtt_data[_positionCurlyBracket] = '{';
       MIBLEsensors[i].eventType.raw = 0;
       if(MIBLEsensors[i].shallSendMQTT==1){
         MIBLEsensors[i].shallSendMQTT = 0;
diff --git a/tasmota/xsns_62_esp32_mi_ble.ino b/tasmota/xsns_62_esp32_mi_ble.ino
index 912b9c798..db1675098 100644
--- a/tasmota/xsns_62_esp32_mi_ble.ino
+++ b/tasmota/xsns_62_esp32_mi_ble.ino
@@ -5,7 +5,7 @@
 
 
   Copyright (C) 2020  Christian Baars and Theo Arends
-  Also Simon Hailes and Robert Klauco 
+  Also Simon Hailes and Robert Klauco
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -1332,27 +1332,6 @@ int MIParsePacket(const uint8_t* slotmac, struct mi_beacon_data_t *parsed, const
   return 1;
 }
 
-
-
-
-#ifdef USE_HOME_ASSISTANT
-/**
- * @brief For HASS only, changes last entry of JSON in mqtt_data to 'null'
- */
-
-void MI32nullifyEndOfMQTT_DATA(){
-  char *p = TasmotaGlobal.mqtt_data + ResponseLength();
-  while(true){
-    *p--;
-    if(p[0]==':'){
-      p[1] = 0;
-      break;
-    }
-  }
-  ResponseAppend_P(PSTR("null"));
-}
-#endif // USE_HOME_ASSISTANT
-
 /*********************************************************************************************\
  * common functions
 \*********************************************************************************************/
@@ -1674,7 +1653,7 @@ int MI32parseMiPayload(int _slot, struct mi_beacon_data_t *parsed){
   char tmp[20];
   BLE_ESP32::dump(tmp, 20, (uint8_t*)&(parsed->payload), parsed->payload.size+3);
   if (BLE_ESP32::BLEDebugMode > 0) AddLog(LOG_LEVEL_DEBUG_MORE,PSTR("M32: MI%d payload %s"), _slot, tmp);
-  
+
   // clear this for every payload
   MIBLEsensors[_slot].pairing = 0;
   MIBLEsensors[_slot].eventType.PairBtn = 0;
@@ -1693,7 +1672,7 @@ int MI32parseMiPayload(int _slot, struct mi_beacon_data_t *parsed){
       uint8_t motion = parsed->payload.data[0];
       res = 0;
     }break;
-    case 0x000f: // 'Someone is moving (with light)' 
+    case 0x000f: // 'Someone is moving (with light)'
       MIBLEsensors[_slot].eventType.motion = 1;
       MIBLEsensors[_slot].lastTime = millis();
       MIBLEsensors[_slot].events++;
@@ -1999,13 +1978,13 @@ void MI32EverySecond(bool restart){
     // show tas style sensor MQTT
     MI32ShowSomeSensors();
   }
-  
-  if (MI32.option.MQTTType == 1 
+
+  if (MI32.option.MQTTType == 1
 #ifdef USE_HOME_ASSISTANT
     ||
     Settings.flag.hass_discovery
 #endif
-  ) { 
+  ) {
     // these two share a counter
     // discovery only sent if hass_discovery
     MI32DiscoveryOneMISensor();
@@ -2545,15 +2524,17 @@ void MI32GetOneSensorJson(int slot, int hidename){
     }
     if (p->feature.lux){
       if(p->eventType.lux || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-        if (p->lux!=0x0ffffff
 #ifdef USE_HOME_ASSISTANT
-          ||(hass_mode!=-1)
+        if ((hass_mode != -1) && (p->lux == 0x0ffffff)) {
+          ResponseAppend_P(PSTR(",\"" D_JSON_ILLUMINANCE "\":null"));
+        } else
+#endif //USE_HOME_ASSISTANT
+        if ((p->lux != 0x0ffffff)
+#ifdef USE_HOME_ASSISTANT
+          || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
         ) { // this is the error code -> no lux
           ResponseAppend_P(PSTR(",\"" D_JSON_ILLUMINANCE "\":%u"), p->lux);
-#ifdef USE_HOME_ASSISTANT
-          if (p->lux==0x0ffffff) MI32nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
         }
       }
     }
@@ -2568,29 +2549,33 @@ void MI32GetOneSensorJson(int slot, int hidename){
     }
     if (p->feature.moist){
       if(p->eventType.moist || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-        if (p->moisture!=0xff
 #ifdef USE_HOME_ASSISTANT
-          ||(hass_mode!=-1)
+        if ((hass_mode != -1) && (p->moisture == 0xff)) {
+          ResponseAppend_P(PSTR(",\"" D_JSON_MOISTURE "\":null"));
+        } else
+#endif //USE_HOME_ASSISTANT
+        if ((p->moisture != 0xff)
+#ifdef USE_HOME_ASSISTANT
+          || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
         ) {
           ResponseAppend_P(PSTR(",\"" D_JSON_MOISTURE "\":%u"), p->moisture);
-#ifdef USE_HOME_ASSISTANT
-          if (p->moisture==0xff) MI32nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
         }
       }
     }
     if (p->feature.fert){
       if(p->eventType.fert || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-        if (p->fertility!=0xffff
 #ifdef USE_HOME_ASSISTANT
-          ||(hass_mode!=-1)
+        if ((hass_mode != -1) && (p->fertility == 0xffff)) {
+          ResponseAppend_P(PSTR(",\"Fertility\":null"));
+        } else
+#endif //USE_HOME_ASSISTANT
+        if ((p->fertility != 0xffff)
+#ifdef USE_HOME_ASSISTANT
+          || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
         ) {
           ResponseAppend_P(PSTR(",\"Fertility\":%u"), p->fertility);
-#ifdef USE_HOME_ASSISTANT
-          if (p->fertility==0xffff) MI32nullifyEndOfMQTT_DATA();
-#endif //USE_HOME_ASSISTANT
         }
       }
     }
@@ -2632,15 +2617,17 @@ void MI32GetOneSensorJson(int slot, int hidename){
   }
   if (p->feature.bat){
     if(p->eventType.bat || !MI32.mode.triggeredTele || MI32.option.allwaysAggregate){
-      if (p->bat != 0x00
 #ifdef USE_HOME_ASSISTANT
-          ||(hass_mode!=-1)
+      if ((hass_mode != -1) && (p->bat == 0x00)) {
+        ResponseAppend_P(PSTR(",\"Battery\":null"));
+      } else
 #endif //USE_HOME_ASSISTANT
-      ) { // this is the error code -> no battery
-      ResponseAppend_P(PSTR(",\"Battery\":%u"), p->bat);
+      if ((p->bat != 0x00)
 #ifdef USE_HOME_ASSISTANT
-          if (p->bat == 0x00) MI32nullifyEndOfMQTT_DATA();
+        || (hass_mode != -1)
 #endif //USE_HOME_ASSISTANT
+      ) {
+        ResponseAppend_P(PSTR(",\"Battery\":%u"), p->bat);
       }
     }
   }
@@ -2888,7 +2875,7 @@ void MI32DiscoveryOneMISensor(){
         return;
       }
       uint8_t isBinary = 0;
-      
+
       ResponseClear();
 
       switch(i/3){
diff --git a/tasmota/xsns_75_prometheus.ino b/tasmota/xsns_75_prometheus.ino
index a358f9697..b28b61685 100644
--- a/tasmota/xsns_75_prometheus.ino
+++ b/tasmota/xsns_75_prometheus.ino
@@ -132,9 +132,7 @@ void HandleMetrics(void) {
 
   ResponseClear();
   MqttShowSensor(); //Pull sensor data
-  char json[ResponseLength()+1];
-  snprintf_P(json, sizeof(json), TasmotaGlobal.mqtt_data);
-  String jsonStr = json;
+  String jsonStr = TasmotaGlobal.mqtt_data;
   JsonParser parser((char *)jsonStr.c_str());
   JsonParserObject root = parser.getRootObject();
   if (root) { // did JSON parsing went ok?